The term ‘refractory metal’ is used to describe a group of metal elements that have exceptionally high melting points and are resistant to wear, corrosion, and deformation.
Industrial uses of the term refractory metal most often refer to five commonly used elements:
The identifying feature of refractory metals is their resistance to heat. The five industrial refractory metals all have melting points in excess of 3632°F (2000°C).
Tungsten is the most widely used refractory metal. It’s melting point is 3410℃, so it still has good conductivity and thermal conductivity under the conditions of low thermal expansion, low vapor pressure, and high temperature. As a form of wire, its high-temperature performance is crucial for the production of lighting products and other products. In […]
Space, once the arena of great power rivalry, now depends on international co-operation for its costly endeavor. The aerospace industry represents the economic, military and technological level of a country, and is also an important symbol of a country’s comprehensive national strength and national defense strength. Of course, the development of the aerospace industry requires […]
Rhenium is classified as a scarce refractory metal. It has the second highest melting point of any of the metals and has relatively high density. Rhenium is produced as a powder from molybdenite, which also contains rhenium sulfide. The rhenium powder is consolidated by pressing and resistance sintering in a vacuum or hydrogen atmosphere. Rhenium […]
As we all know, melting point is the temperature at which substance converts from solid state to liquid state. Some of the metals show very high melting points at least 2,000 degrees Celsius, and they also have very high physical strength. These metals are named as refractory metals. Niobium, molybdenum, tantalum, tungsten and rhenium are […]
More than 350 years ago, porcelain makers in China incorporated a unique peach colour into their designs by means of a tungsten pigment that was not known in the West. Indeed it was not for another century that chemists in Europe became aware of it. In 1779, Peter Woulfe examined a mineral from Sweden and […]
Only tungsten and carbon have higher melting points. Rhenium has good wear resistance and it can withstand arc corrosion. It is soluble in nitric and sulphuric acids. Applications for the metal include its use as an alloying element with tungsten. The rhenium powder is a light-gray metal powder made of agglomerated single crystals. Rhenium has […]
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